Use the following to answer questions: 
-(Table: Externalities from Parks) The table Externalities from Parks shows the marginal social benefit and the marginal social cost of preserving various amounts of land in a city for a public park. If the government wants to achieve the optimum amount of land for the park, it could use a Pigouvian _____ of _____.
Definitions:
Ferns
A group of non-flowering plants that reproduce via spores and have large, divided leaves known as fronds.
Flowering Plants
Plants that produce flowers as their reproductive structures; this group is also known as angiosperms.
Evolutionary Expansion
The process by which species evolve and diversify over time, leading to a broad range of biological forms and functions.
Integuments
Outer protective layers of an organism, which in plants can refer to seed coats and in animals to skin.
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